Fujimori, whose father Alberto was Peru's authoritarian leader throughout the 1990s, garnered nearly twice as many votes as runner-up Kuczynski in the first-round election.
The free-market model that has been in place for 25 years in Peru would be maintained in either a Kuczynski or Fujimori presidency.
Kuczynski, 77, is more liberal on social issues than Fujimori but is considered slightly more to the right in economic policy.
Below are key policies supported by Fujimori and Kuczynski, one of whom will succeed President Ollanta Humala when his term ends on July 28.
KEIKO FUJIMORI
A 41-year-old former lawmaker who lost the presidency to Humala in 2011, Fujimori has moderated her right-wing stance and pledged not to repeat the autocratic actions of her father.
The elder Fujimori closed Peru's Congress in 1992 and was later jailed for corruption and human rights abuse.
To boost economic growth that has waned in recent years due to falling mineral prices, Fujimori pledged to ramp up stimulus spending on infrastructure in a country that remains largely undeveloped beyond its big cities. Her economic adviser said she would raise the tax rate and widen the fiscal deficit.
While friendly to business, Fujimori says she would not back rural mining projects unless they have the support of nearby towns. She has said she would slap stiff fines on polluting companies or revoke their operating licenses.
Fujimori is tough on crime and wants to build prisons at high altitudes in the Andes to isolate prisoners. She also wants the military to protect government institutions and supports the death penalty for rapists of young children.
PEDRO PABLO KUCZYNSKI
A former prime minister, Kuczynski is popular among Peru's business elite and pledges to cut red tape and seek private partners to roll out new infrastructure projects.
He also promises to lower sales taxes to broaden the payer base while giving rebates to big companies that reinvest their profits.
Kuczynski says he would personally negotiate with opponents of proposed mines to ease conflicts in the world's No. 3 copper producer, and make sure communities see benefits to mining before projects start.
The septuagenarian promises to manually eradicate coca plants and squash remaining bands of Shining Path rebels by 2018. He promised to boost police patrols and triple the number of detectives as crime became a greater voter concern.